Door actuator

Abstract

A door operator for operating a door includes a housing, an output shaft with a cam disc, an opening piston guided in the housing, which piston, on a first side, bears against the cam disc, an energy accumulator acting upon the opening piston for storing a closing energy for the door, and a damping piston guided in a cylindrically shaped hollow space of a cylinder element, and which piston, on a second side, bears against the cam disc, wherein the cylinder element is firmly connected to the opening piston.

The invention claimed is: 
     
       1. A door operator ( 1 ) for operating a door, comprising:
 a housing ( 2 ); 
 an output shaft ( 3 ) having a cam disc ( 6 ); 
 a cylinder element ( 8 ), an exterior surface of the cylinder element ( 8 ) bearing against the housing ( 2 ); 
 an opening piston ( 7 ), guided in the housing ( 2 ), the opening piston ( 7 ), on a first side, bearing against the cam disc ( 6 ); 
 an energy accumulator ( 10 ) configured to act upon the opening piston ( 7 ) to accumulate a closing energy for the door; 
 a damping piston ( 16 ) guided in a cylindrically shaped hollow space ( 15 ) of the cylinder element ( 8 ), the damping piston bearing against the cam disc ( 6 ) on a second side; and 
 a compression spring ( 19 ) arranged between a side of the damping piston ( 16 ) facing away from the cam disc ( 6 ) and the housing ( 2 ), 
 wherein the cylinder element ( 8 ) is firmly connected to the opening piston ( 7 ). 
 
     
     
       2. The door operator according to  claim 1 , wherein the energy accumulator ( 10 ) comprises at least one closer spring. 
     
     
       3. The door operator according to  claim 1 , wherein the opening piston ( 7 ) comprises a first pressure roller ( 12 ) bearing against the cam disc ( 6 ). 
     
     
       4. The door operator according to  claim 1 , wherein the damping piston ( 16 ) comprises a second pressure roller ( 14 ) bearing against the cam disc ( 6 ). 
     
     
       5. The door operator according to  claim 1 , wherein the exterior surface of the cylinder element ( 8 ) is guided in the housing ( 2 ). 
     
     
       6. The door operator according to  claim 1 , wherein the cylinder element ( 8 ) and the opening piston ( 7 ) together are integrally manufactured. 
     
     
       7. The door operator according to  claim 1 , further comprising a non-return valve ( 20 ) in the damping piston ( 16 ). 
     
     
       8. A door operator ( 1 ) for operating a door, comprising:
 a housing ( 2 ); 
 an output shaft ( 3 ) having a cam disc ( 6 ); 
 a cylinder element ( 8 ), an exterior surface of the cylinder element ( 8 ) bearing against the housing ( 2 ); 
 an opening piston ( 7 ), guided in the housing ( 2 ), the opening piston ( 7 ), on a first side, bearing against the cam disc ( 6 ); 
 an energy accumulator ( 10 ) configured to act upon the opening piston ( 7 ) to accumulate a closing energy for the door; and 
 a damping piston ( 16 ) guided in a cylindrically shaped hollow space ( 15 ) of the cylinder element ( 8 ), the damping piston bearing against the cam disc ( 6 ) on a second side, 
 wherein the cylinder element ( 8 ) is firmly connected to the opening piston ( 7 ), and 
 wherein the output shaft ( 3 ) and the cam disc ( 6 ) are disposed between the opening piston ( 7 ) and the cylinder element ( 8 ). 
 
     
     
       9. A door operator ( 1 ) for operating a door, comprising:
 a housing ( 2 ); 
 an output shaft ( 3 ) having a cam disc ( 6 ); 
 a cylinder element ( 8 ), an exterior surface of the cylinder element ( 8 ) bearing against the housing ( 2 ); 
 an opening piston ( 7 ), guided in the housing ( 2 ), the opening piston ( 7 ), on a first side, bearing against the cam disc ( 6 ); 
 an energy accumulator ( 10 ) configured to act upon the opening piston ( 7 ) to accumulate a closing energy for the door; 
 a damping piston ( 16 ) guided in a cylindrically shaped hollow space ( 15 ) of the cylinder element ( 8 ), the damping piston bearing against the cam disc ( 6 ) on a second side; and 
 two or four webs ( 9 ) arranged between the opening piston ( 7 ) and the cylinder element ( 8 ) to connect the opening piston ( 7 ) to the cylinder element ( 8 ), 
 wherein the cylinder element ( 8 ) is firmly connected to the opening piston ( 7 ).